Duplexer and module comprising same

A duplexer includes a piezoelectric substrate, a reception filter formed on the piezoelectric substrate and having a plurality of resonators, and a transmission filter formed on the piezoelectric substrate and having a plurality of resonators, in which one of the resonators of the reception filter is a multi-modal elastic wave resonator, and the other of the resonators of the transmission filter is a multi-modal elastic wave resonator. The capacitance of the resonator is more than twice the average capacitance of other resonators formed on the piezoelectric substrate. Thus, a duplexer of a multi-mode elastic wave resonator which is closer to a rectangle and has passband characteristics of low loss and excellent steepness, and a module having the duplexer are provided. 一种双工器，包含：压电基板、形成在所述压电基板且具有多个共振器的接收滤波器，及形成在所述压电基板上且具有多个共振器的发送滤波器，其中，所述接收滤波器的共振器的其中一个为多模态弹性波共振器，其电容为形成在所述压电基板上的其他共振器的平均电容的两倍以上。借此，提供一种更接近矩形，且具有低损耗及优良陡峭度的通带特性的多模态弹性波共振器的双工器，及具有所述双工器的模块。